/**
 * Interface for email recipient
 */
export interface EmailRecipient {
  email: string;
  name?: string;
}

/**
 * Interface for email attachment
 */
export interface EmailAttachment {
  filename: string;
  content: string | Buffer;
  contentType?: string;
  encoding?: string;
  path?: string;
}

/**
 * Interface for email options
 */
export interface EmailOptions {
  from: EmailRecipient;
  to: EmailRecipient | EmailRecipient[];
  cc?: EmailRecipient | EmailRecipient[];
  bcc?: EmailRecipient | EmailRecipient[];
  subject: string;
  text?: string;
  html?: string;
  attachments?: EmailAttachment[];
  replyTo?: string;
  headers?: Record<string, string>;
  template?: string;
  context?: Record<string, any>;
}

/**
 * Interface for email response
 */
export interface EmailResponse {
  success: boolean;
  messageId?: string;
  error?: {
    message: string;
    code?: string;
    provider?: EmailProviderType;
    details?: {
      rejected?: string[];
      accepted?: string[];
      smtpResponse?: string;
      sendgridResponse?: any;
      sesResponse?: any;
    };
  };
}

/**
 * Interface for SMTP configuration
 */
export interface SmtpConfig {
  host: string;
  port: number;
  secure?: boolean;
  auth?: {
    user: string;
    pass: string;
  };
  tls?: {
    rejectUnauthorized?: boolean;
  };
}

/**
 * Interface for SendGrid configuration
 */
export interface SendGridConfig {
  apiKey: string;
}

/**
 * Interface for AWS SES configuration
 */
export interface SesConfig {
  region: string;
  accessKeyId?: string;
  secretAccessKey?: string;
  sessionToken?: string;
  credentials?: any; // AWS.Credentials type
  endpoint?: string;
  apiVersion?: string;
  maxRetries?: number;
  httpOptions?: {
    timeout?: number;
    connectTimeout?: number;
  };
}

/**
 * Email provider type
 */
export enum EmailProviderType {
  SMTP = 'smtp',
  SENDGRID = 'sendgrid',
  SES = 'ses',
}

/**
 * Email provider configuration
 */
export interface EmailProviderConfig {
  type: EmailProviderType;
  config: SmtpConfig | SendGridConfig | SesConfig;
}